Prism-telescope and similar prism-carrying device and means for adjusting the prisms.



H. JACOB.

,PRISM TELESGOPE AND SIMILAR PRISM CARRYING DEVICE AND MEANS IGB ADJUSTING THE PRISM8.

APPLICATION run!) an 21, 190B.

Patented R0117, 19138.

Fig.3.

nnrmon Iacoa'or S'l-EGLITZ, NEAR BERLIN, GERMANY, ASSIGNQE oPrIsoHE ANsT L'r-o. P. GOERIZ AKTIENGESELLSCEAFT, OFERIEDENKU', NEAR; BEBE;

LIN GERMANY.

rzsrsiarnmscorm' Ann snnmn Pmsn-onn'nrnes mviennun mans a Amus'rm'e 'rm'i rnrsms.

Specification o! Lettersratent. v

ratent u'nov. 1'7. 1

Application filed Key 21, mos. seen Np. areas.

To all whom it may concern:

Be it known that I, HEINRICH. JAooB, a citizen of the German Empire, and resident of Steglitz, near Berlin, Germany, engineer,

, have invented certainnew and useful Improvementsin Prism-Telesco es and Similar Prism-Carrying Dev ces an 1n Means for Adjusting the Prisms Thereof, of which the following is a specification.

This invention relates to improvements in prism-telescopes and similar prism carryingdeviees and in means for adjusting the prisms thereof. 1

The purpose of the invention is to allow of convenient lateral displacement and adjustment of the prisms on their seats without the use of ad usting-members,- which extend through the lateral walls of the casing or chamber containingthe prisms. This effected, according to the present invention, by exerting ressure on prism surfaces which are inclined relatively to the seats of the prisms. This method of adjustment allows of using adjustingmembers, which are movable perpendicularly or substantially perpendicularly to the surfaces of the seats. Inprism-telesco es this direction of adjustment of the ad ustin members is parallel or substantiallyparal e1 to the optical axis of the telescope. The adjusting members of rism-telescopes can therefore be conveniently actuated from the ends of the telescope tubes or casing. A particularly convenient arrangement is obtained by havin the prism adjusting screws co axial wit the fixing-screws of the end-cover of the casing, since in that case no enlargement of the walls is necessary for the reception of the prismadjustlng screws.

The invention isillustrated in theannexed drawing, in which Figure 1 shows a prism-telescope, partly in section, provided with the improved adjusting device. Fig. 2 is an end View of the telescope, partlyin section, and 3 illustrates a modification of the prism-adjusting device.. J

The doubletelesc p shown in Figs. land 2 is provided with orro prisms 1 and 2. The Porro prisms are mountedwith their hypotenuse-surfaces on a bridgeiece 3 of the telescope casing 4. Wedgeike abutment-pie'ces 5 are arranged in contact with the adj ustin the 'inclinedr. lateral surfaces of the and the ends-of'adjusting screws}; abut;

against these abutmentieces. The screws 6 work in" holes 7 paral el with the axes of the telescope. These holes -7 are also engagedby thgscrews 8 which fix the covers 9. If, for-purposesof adjustment, a lateraldispiacement of one of the prisms is necessary, the adjusting screw 6 at the side towards which the prism is to be moved is more or less unscrewed, i. e; removed fromcontact with the respective abutment-piece 5, and the adjusting screw 6 at. the other side is screwed towards the-seat. The abutment-piece 5 in contact with the latter screw 6 is thus causedto displace theprism in thedesired direction. When thepnsm-is in the desired positionthe loosened adjusting screw is ti htened u agaim'so that the prism is y fixed.- fter the adjustment the covers 9 may be put on andfastened by means of the screws 8, which also enter the holes 7, ,The apertures which enable the adjusting devices to be actuated are thus se' curely c Q sed.-1 The final adjustment of the pri'sms before use may also be effected with the covers 9 in position but not-screwed on, the screw-driverbeing inserted through the holes provided in the covers for the screws 8. Readj-ustment after use can also be effectedin this manner, without taking off the covers, which is of a'great advantage, since it prevents the entrance, of dust into the interior of the telescope.

' In the modification illustrated in Fig.3

members consist of movable plates or r0 3 10 which have inclined abutment-pieces or feet 11 normall in contact with the inclined lateral sur aces" of the prism l. Screws 12 pass through slots in the said plates and are screwed into-holes in the Walls of the prism chamber. No part "of'the adjusting device extends through the said walls. The adjustment is efiected thmstin" -one of the feet 11 agamsutne' rism w lnle the vother foot is free to-move. Vhen the prism has been properly adjusted both the parts 10. are securely fastened by means of the screws 12.

The surfaces of the parts 5 and feet 11- in contact withthe prism-surfaces inclined.

relatively to the seat of theprism are preferably concave orrecessed so that they onlyhaving two surfacesinclined to the seat surmake contact with the optically uneffective edge-parts of the prism.

- Having 'now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed,'I declare that 'what I claim is:

1. In combination with a prism carrying optical device, such as a prism-telescope, a seat, a prism mounted thereon and having a surface inclined relatively to said seat, a casing for said seat and said prism, adjustingvmeans for said prism mounted-in said casing adapted to exert pressure on said rism-surface inclined to the prism-seat and adjustable in a direction which intersects the prism-seat. f

2. In combination witha prism carrying optical device, such as a prism-telescope, a

seat, a prism mounted thereon having substantially. a triangular cross section with acute angles at the ends of the seat section line, a casingfor said seat and said prism, and adjusting members adapted to cooperate with, each of thetwo prisngsurfaces inclined relatively to the seat surface respectively, said adjusting members mounted in said casing and adjustable in a direction which intersects the prism-seat.

3.; In a prism-telescope a casing, a prismseat transverse to the optical axis of the telescope, :a, pr1sm.-mountedthereon, said prism face, each including an'acute angle there-' with, wedge-like members cooperating with each of sand two prism-surfaces inclined to the seat respectively, said wedge-like members'adapted to be adjusted in a direction substantially parallel to the optical axis of the instrument.

4. In a prism-telescope. a casing, a prism- -sea t transverse to the optical axis of the tele-. scope, a prism mounted thereon, said prism having two surfaces inclined to the seat surface, each including an acute angle therewith, wedge-like members cooperating with each of said two prism-surfaces inclined to the seat respectively, an :Ld1USt-llig screw in cotiperation with each of said wedge-like members and located in said casing parallel to the optical axis of the instrument.

5. In a prism-telescope a casing, a prismseat transverse to the optical axis of the telescope, a prism mounted thereon, said prism having two surfaces inclined to the seat, surface, each including an acute angle therewith, wedge-like members cooperating with'each of said two prism-surfa ces inclined to thtfseat respectively, said wedge-like members being concave or recessed at their surfaces directed towards the prism-surfaces in 'cooperation therewith and adapted to be adjusted in 'a direction substantially parallel to the optical axis of the telescope.

6. In a prism-telescope a casing, a prismseat transverse to the optical axis of the telescope, a prism mounted thereon, said prism having two surfaces inclined to the seat surface, e'achincluding an acute angle therewith, wedge-lik'e members cooperating with each of said two prism-surfaces inclined to the seat respectively, an adjusting screw in cooperation with each of said wedge-like members, screw holes in the body of the easing guiding said adjusting screws, a cover adapted to close the prism containing casing,-

HEINRICH JACOB.

IVitnesses HENRY HAsPEn, WOLDEMAR H-Aur'r. 

